@nestjs/graphql/dist/decorators/directive.decorator.js

Nest - modern, fast, powerful node.js web framework (@graphql)

import { parse } from 'graphql';
import { DirectiveParsingError } from '../schema-builder/errors/directive-parsing.error.js';
import { LazyMetadataStorage } from '../schema-builder/storages/lazy-metadata.storage.js';
import { TypeMetadataStorage } from '../schema-builder/storages/type-metadata.storage.js';
/**
 * Adds one or more directives to a field, type, or handler. Passing an array
 * attaches every directive in a single decorator call, equivalent to stacking
 * multiple `@Directive(...)` decorators.
 *
 * @publicApi
 */
export function Directive(sdl) {
    const sdls = Array.isArray(sdl) ? sdl : [sdl];
    sdls.forEach(validateDirective);
    return (target, key) => {
        LazyMetadataStorage.store(() => {
            sdls.forEach((singleSdl) => {
                if (key) {
                    TypeMetadataStorage.addDirectivePropertyMetadata({
                        target: target.constructor,
                        fieldName: key,
                        sdl: singleSdl,
                    });
                }
                else {
                    TypeMetadataStorage.addDirectiveMetadata({
                        target: target,
                        sdl: singleSdl,
                    });
                }
            });
        });
    };
}
function validateDirective(sdl) {
    try {
        parse(`type String ${sdl}`);
    }
    catch (err) {
        throw new DirectiveParsingError(sdl);
    }
}